CODED MODULATION WITH AMPLITUDE AND PHASE-SHIFT KEYING HAVING A CIRCULAR CONSTELLATION FOR VARIABLE SPECTRAL EFFICIENCY

摘要

A system and method are described involving a coded modulation scheme using an M-APSK format with a circular constellation. A maximum achievable spectral efficiency for the transmitters may be selected [202] and a spectral efficiency step-size of the maximum achievable spectral efficiency may be specified [204]. The spectral efficiency for any transmitter in the system may be individually selected by reducing its spectral efficiency from the maximum achievable spectral efficiencies [206] by a selected number of steps corresponding to the step size [208].